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Ray I, Möller-Levet CS, Michael A, Butler-Manuel S, Chatterjee J, Tailor A, Ellis PE, Meira LB. Circulating Adipocytokines and Insulin Like-Growth Factors and Their Modulation in Obesity-Associated Endometrial Cancer. Cancers (Basel) 2024; 16:531. [PMID: 38339282 PMCID: PMC10854745 DOI: 10.3390/cancers16030531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/13/2024] [Accepted: 01/23/2024] [Indexed: 02/12/2024] Open
Abstract
The rising global incidence of uterine cancer is linked to the escalating prevalence of obesity. Obesity results in alterations in adipocytokines and IGFs, driving cancer progression via inflammation, increased cell proliferation, and apoptosis inhibition, although the precise mechanisms are still unclear. This study examined a set of six markers, namely, adiponectin, leptin, IL6, TNFα, IGF1, and IGF2 and compared them between fifty age-matched endometrial cancer patients (study group) and non-cancer patients with benign gynaecological conditions (control group). We also assessed the relationship of these markers with obesity and explored the correlation between these markers and various tumour characteristics. In the cancer population, these markers were also assessed 24 h and 6 months post-surgery. Remarkably, low adiponectin levels were associated with a 35.8% increase in endometrial cancer risk. Interestingly, compared to control subjects where IGF levels decreased after menopause, post-menopausal women in the study group showed elevated IGF1 and IGF2 levels, suggesting a potential influence of endometrial cancer on the IGF system, particularly after menopause. Lastly, it is noteworthy that a discernible inverse relationship trend was observed in the levels of adipocytokines and IGFs 6 months post-surgery. This indicates that treatment for endometrial cancer may have a differential impact on adipocytokines and IGFs, potentially holding clinical significance that merits further investigation.
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Affiliation(s)
- Irene Ray
- Department of Clinical and Experimental Medicine, University of Surrey, Daphne Jackson Road, Guildford GU2 7WG, UK
- Academic Department of Gynaecological Oncology, Royal Surrey NHS Foundation Trust, Egerton Road, Guildford GU2 7XX, UK
| | - Carla S. Möller-Levet
- Bioinformatics Core Facility, University of Surrey, Daphne Jackson Road, Guildford GU2 7WG, UK
| | - Agnieszka Michael
- Department of Clinical and Experimental Medicine, University of Surrey, Daphne Jackson Road, Guildford GU2 7WG, UK
- Department of Oncology, Royal Surrey NHS Foundation Trust, Egerton Road, Guildford GU2 7XX, UK
| | - Simon Butler-Manuel
- Academic Department of Gynaecological Oncology, Royal Surrey NHS Foundation Trust, Egerton Road, Guildford GU2 7XX, UK
| | - Jayanta Chatterjee
- Academic Department of Gynaecological Oncology, Royal Surrey NHS Foundation Trust, Egerton Road, Guildford GU2 7XX, UK
- Department of Life Sciences, Brunel University London, Kingston Lane Uxbridge, Middlesex, Uxbridge UB8 3PH, UK
| | - Anil Tailor
- Academic Department of Gynaecological Oncology, Royal Surrey NHS Foundation Trust, Egerton Road, Guildford GU2 7XX, UK
| | - Patricia E. Ellis
- Department of Clinical and Experimental Medicine, University of Surrey, Daphne Jackson Road, Guildford GU2 7WG, UK
- Academic Department of Gynaecological Oncology, Royal Surrey NHS Foundation Trust, Egerton Road, Guildford GU2 7XX, UK
| | - Lisiane B. Meira
- Department of Clinical and Experimental Medicine, University of Surrey, Daphne Jackson Road, Guildford GU2 7WG, UK
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Ray I, Meira LB, Michael A, Ellis PE. Correction to: Adipocytokines and disease progression in endometrial cancer: a systematic review. Cancer Metastasis Rev 2022:10.1007/s10555-022-10020-y. [PMID: 35084608 DOI: 10.1007/s10555-022-10020-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Irene Ray
- University of Surrey, Daphne Jackson Road, Guildford, GU2 7WG, UK.
- Royal Surrey NHS Foundation Trust, Egerton Road, Guildford, GU2 7XX, UK.
| | - Lisiane B Meira
- University of Surrey, Daphne Jackson Road, Guildford, GU2 7WG, UK
| | - Agnieszka Michael
- University of Surrey, Daphne Jackson Road, Guildford, GU2 7WG, UK
- Royal Surrey NHS Foundation Trust, Egerton Road, Guildford, GU2 7XX, UK
| | - Patricia E Ellis
- University of Surrey, Daphne Jackson Road, Guildford, GU2 7WG, UK
- Royal Surrey NHS Foundation Trust, Egerton Road, Guildford, GU2 7XX, UK
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Ellis PE, Barron GA, Bermano G. Adipocytokines and their relationship to endometrial cancer risk: A systematic review and meta-analysis. Gynecol Oncol 2020; 158:507-516. [PMID: 32507648 DOI: 10.1016/j.ygyno.2020.05.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 05/21/2020] [Indexed: 01/10/2023]
Abstract
OBJECTIVE To investigate the association between circulating levels of adipocytokines (adiponectin, leptin, tumour necrosis factor alpha (TNFα), interleukin 6 (IL-6)) and growth factors (insulin-like growth factor I (IGF-I) and II (IGF-II)), and the risk of endometrial cancer. METHODS Cochrane, CINAHL, Embase, Medline and Web of Science were searched for English-language manuscripts published between January 2000 and August 2018 using the following string of words: cancer and endometrial and (obesity or BMI) and (adiponectin or TNF* or IGF-I or IGF-II or IL-6 or leptin). RESULTS Twenty articles were included in this meta-analysis, which corresponded to 18 studies involving 2921 endometrial carcinoma cases and 5302 controls. Fourteen articles reported circulating levels for adiponectin, seven for leptin, three for TNFα, three for IL-6 and one for IGF-I. No article reported values for IGF-II. Patients with circulating adiponectin levels in the highest tertile had decreased endometrial cancer risk compared to women with levels in the lowest tertile, (summary of odds ratio (SOR) 0.51, 95% confidence interval (CI): 0.38-0.69, p < 0.00001). Women with circulating leptin concentrations in the highest tertile had increased endometrial cancer risk compared to women with concentrations in the lowest tertile (SOR 2.19, 95% CI: 1.45-3.30, p = 0.0002). There was no difference in cancer risk between participants with the highest TNFα and IL-6 levels compared to the lowest levels (SOR 1.27, 95% CI: 0.88-1.83, p = 0.20 and SOR 1.20, 95% CI: 0.89-1.63, p = 0.23, respectively). CONCLUSIONS Endometrial cancer risk is inversely affected by adiponectin and leptin levels. There appears to be no relationship between TNFα and IL-6 and the overall risk of endometrial cancer.
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Affiliation(s)
- Patricia E Ellis
- Centre for Obesity Research and Education (CORE), School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen AB107GJ, United Kingdom of Great Britain and Northern Ireland; Royal Surrey County Hospital, Egerton Road, Guildford, Surrey GU2 7XX, United Kingdom of Great Britain and Northern Ireland
| | - Gemma A Barron
- Centre for Obesity Research and Education (CORE), School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen AB107GJ, United Kingdom of Great Britain and Northern Ireland
| | - Giovanna Bermano
- Centre for Obesity Research and Education (CORE), School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen AB107GJ, United Kingdom of Great Britain and Northern Ireland.
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Abstract
Equilibrium constants for the binding of sulfur bases to cobalt(II) porphyrins were measured in toluene solution by a spectrophotometric method. The order of decreasing binding strength of sulfur ligands to cobalt(II) porphyrins was found to be mercaptide ions >> thioethers > mercaptans. It is suggested that a similar stability order of these sulfur ligands should exist towards iron(II) porphyrins, but formation constants could be obtained only for the mercaptide ions.
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Affiliation(s)
- P E Ellis
- Department of Chemistry, Northwestern University, Evanston, Illinois 60201
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Ellis PE, MacLean AB, Crow JC, Wong Te Fong LF, Rolfe KJ, Perrett CW. Expression of cyclin D1 and retinoblastoma protein in Pagetâs disease of the vulva and breast: an immunohistochemical study of 108 cases. Histopathology 2009; 55:709-15. [DOI: 10.1111/j.1365-2559.2009.03434.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Paget's disease of the vulva is an uncommon lesion, and gynaecologists and dermatologists generally have limited experience in its management. The British Society for the Study of Vulval Disease has established a register of cases, and we present a review of 76 cases registered to date. The majority of patients were treated by surgical excision and reconstruction, but non-surgical therapies are an option. Recent literature is reviewed to allow comparison.
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Affiliation(s)
- A B MacLean
- Department of Obstetrics and Gynaecology, Royal Free and University College Medical School, London, UK.
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Ellis PE, Cano SD, Fear M, Kelsell DP, Ghali L, Crow JC, Perrett CW, MacLean AB. Reduced E-cadherin expression correlates with disease progression in Paget's disease of the vulva but not Paget's disease of the breast. Mod Pathol 2008; 21:1192-9. [PMID: 18469796 DOI: 10.1038/modpathol.2008.50] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The growth and metastasis of many cancers is due in part to loss of cell-cell adhesion. E-cadherin, plakoglobin and beta-catenin are important in cell adhesion. Our aim was to examine the presence of these molecules in Paget's disease of the vulva and Paget's disease of the breast, and to correlate any differences in their expression with the presence of invasive disease or an underlying carcinoma. Sixty-three archival cases of Paget's disease of the vulva, including eight associated with invasive disease, and 23 archival cases of Paget's disease of breast, which included 10 cases with ductal carcinoma in situ alone, four cases with both ductal carcinoma in situ and invasive carcinoma, and five cases with underlying invasive carcinoma alone, were analysed immunohistochemically for expression of E-cadherin, plakoglobin and beta-catenin proteins. The respective mRNAs were also detected by in situ hybridisation using digoxigenin-labelled cRNA probes. Seventy-six percent (41/54) of Paget's disease of vulva cases had >50% of Paget cells expressing the E-cadherin protein, compared with 28 % (2/7) of Paget's disease vulva with invasive disease. This result was significant, with a P-value of 0.039. Twenty-five percent (14/55) of the intraepidermal Paget's disease of the vulva cases had >50% of Paget cells expressing the plakoglobin protein, compared with 12% (1/8) of cases of Paget's disease of vulva with invasive disease, and for beta-catenin, 9% (5/55) of the non-invasive Paget's disease of the vulva had >50% of Paget cells expressing beta-catenin, compared with 12% (1/8) of Paget's disease of the vulva cases with invasive disease. Sixty-five percent (15/23) of the Paget's disease of the breast had >50% of Paget cells expressing E-cadherin, and for plakoglobin and beta-catenin it was 17% (4/23) and 28% (6/21), respectively. The results were not significant. The results suggest that reduced expression of E-cadherin may have a role to play in the pathogenesis of invasive Paget's disease of the vulva. Abnormal plakoglobin expression may be involved in the formation of some cases of Paget's of the vulva and the breast.
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Affiliation(s)
- Patricia E Ellis
- Department of Obstetrics and Gynaecology, Royal Free and University College Medical School (Hampstead Campus), University College London, London, UK.
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Abstract
OBJECTIVE To assess whether articulating casts in centric relation (CR) compared with intercuspal position (ICP) makes a difference to treatment planning. DESIGN Reliability analysis. SUBJECTS Ten orthodontists. METHODS Twenty case vignettes were examined on three occasions: twice with the casts in ICP and once in CR. A series of dichotomous decisions were made relating to the treatment need and treatment mechanics. MAIN OUTCOME MEASURES The changes in treatment decisions were examined. Intra-examiner agreement between the two hand-held cast assessments (H1 v. H2) and between the first set of hand-held casts compared with the articulated casts (H1 v. A1) were evaluated using the kappa statistic. The differences between the kappa statistics for H1 v. H2 and H1 v. A1 were then tested with the Wilcoxon matched pairs signed rank sum test. RESULTS The only statistically significant change in the kappa score between H1 v. H2 and H1 v. A1 was for the extraction decision (P= 0.007). No other statistically significant differences were found for the other treatment decisions, although trends were identified for orthognathic surgery and anchorage support decisions. CONCLUSION Routine articulation of study models for all orthodontic patients is not supported by the results of this study. Articulation of the study models did not affect the treatment planning decisions in a meaningful manner. Further work with selected samples is required to determine if articulation is helpful for specific malocclusions.
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Affiliation(s)
- P E Ellis
- Charles Clifford Dental Hospital, Sheffield, UK.
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Abstract
OBJECTIVE To report on a study where 97 subjects were screened for mutations in the Treacher Collins syndrome (TCS) gene TCOF1. METHOD Ninety-seven subjects with a clinical diagnosis of TCS were screened for potential mutations in TCOF1, by means of single strand conformation polymorphism (SSCP) analysis. In those subjects where potential mutations were detected, sequence analysis was performed to determine the site and type of mutation present. RESULTS Thirty-six TCS-specific mutations are reported including 27 deletions, six point mutations, two splice junction mutations, and one insertion/deletion. This brings the total number of mutations reported to date to 105. CONCLUSION The importance of detection of these mutations is mainly in postnatal diagnosis and genetic counselling. Knowledge of the family specific mutation may also be used in prenatal diagnosis to confirm whether the foetus is affected or not, and give the parents the choice of whether to continue with the pregnancy.
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Affiliation(s)
- P E Ellis
- Orthodontic Department, Charles Clifford Dental Hospital, Sheffield, UK.
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Ellis PE, Fong LFWT, Rolfe KJ, Crow JC, Reid WMN, Davidson T, MacLean AB, Perrett CW. The role of p53 and Ki67 in Paget's disease of the vulva and the breast. Gynecol Oncol 2002; 86:150-6. [PMID: 12144821 DOI: 10.1006/gyno.2002.6629] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Paget's disease of the vulva (PDV) and Paget's disease of the breast (PDB) are uncommon diseases, accounting for approximately 1% of all vulval neoplasms and 0.5-4% of all breast cancers, respectively. In 10-30% of vulval cases an invasive adenocarcinoma is present. In such cases the disease is often aggressive and recurrence rate is high. This is in contrast to PDB where the general consensus is that almost all cases are associated with an in situ or invasive ductal carcinoma. Our aim was to examine the presence of the tumor suppressor protein p53 and the proliferation marker Ki67 in PDV and PDB and correlate any differences in the expression of these two proteins with the presence of an underlying carcinoma. METHODS Immunohistochemistry was performed on 52 archival cases of PDV, which included 10 with associated invasive adenocarcinoma of the vulva, and on 37 archival cases of PDB, including 26 with available associated ductal carcinoma in situ (DCIS) or invasive carcinoma of the breast. All cases were formalin-fixed and paraffin wax-embedded. Monoclonal antibodies were used with microwave antigen retrieval. Streptavidin-biotin-horseradish peroxidase and 3,3'-diaminobenzidine detection methods were employed to visualize antibody binding and staining. A section was scored positive for p53 if more than 10% of cell nuclei were stained brown and Ki67 was expressed as a percentage of positive cells to the nearest 5% of cells showing nuclear positivity (Ki67 staining index). RESULTS p53 was expressed in 15 of 52 (29%) PDV cases and 5 of 37 (13%) cases of PDB. Four of the ten cases (40%) of PDV associated with invasive disease expressed p53 compared with 11 of 42 (26%) cases without invasive disease. The mean Ki67 staining index for PDV associated with invasion was 19%, and for that without invasion, 16%. In the breast cases, the mean staining index was 11%. CONCLUSION Our data suggest that p53 may have a role to play in PDV progression, and may be a late event in some cases, especially those associated with invasive disease. Ki67 has no apparent prognostic role in PDV as there was no significant difference between those cases associated with and those without invasive disease. Neither p53 nor Ki67 appears to have a prognostic role to play in PDB.
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Affiliation(s)
- P E Ellis
- Department of Obstetrics and Gynaecology, Royal Free & University College Medical School (Royal Free Campus), London, United Kingdom
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Ellis PE, Wong Te Fong LF, Rolfe KJ, Crow JC, Reid WMN, Davidson T, MacLean AB, Perret CW. The role of vascular endothelial growth factor-A (VEGF-A) and platelet-derived endothelial cell growth factor/thymidine phosphorylase (PD-ECGF/TP) in Paget's disease of the vulva and breast. Anticancer Res 2002; 22:857-61. [PMID: 12014662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
BACKGROUND Paget's disease of the vulva and the breast are uncommon conditions. The pathogenesis underlying these diseases is still unclear. Vascular endothelial growth factor-A (VEGF-A), a potent angiogenic factor, has been demonstrated in a variety of tumour cell types and is thought to be involved in tumour expansion. Platelet-derived endothelial cell growth factor/thymidine phosphorylase (PD-ECGF/TP) has also been shown to stimulate angiogenesis. MATERIALS AND METHODS Fifty-four cases of Paget's disease of the vulva, including 10 with an associated invasive adenocarcinoma, and 38 cases of Paget's disease of the breast, including 26 with available associated ductal carcinoma in situ (DCIS) and/or invasive carcinoma of the breast, were evaluated immunohistochemically for the expression of VEGF-A and PD-ECGF/TP. RESULTS VEGF-A was not expressed in Paget's disease of the vulva or breast. PD-ECGF/TP was expressed in 22 out of 54 (41%) cases of Paget's disease of the vulva. Four of the cases associated with invasive disease (40%) expressed PD-ECGF/TP. Twenty-one out of 38 (55%) cases of Paget's disease of the breast were positive for PD-ECGF/TP. CONCLUSION Our data suggest that PD-ECGF/TP may have a role to play in the pathogenesis of Paget's disease of the vulva and the breast. The role of VEGF-A in Paget's disease of the vulva and the breast remains to be fully elucidated.
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Affiliation(s)
- Patricia E Ellis
- Department of Obstetrics and Gynaecology, Royal Free & University College Medical School, London, UK
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Ellis PE, Ellis SGS, O'Brien KD, Joshi RI. So you want to be a specialist registrar?--What to put in your CV. Br Dent J 2002; 192:133-6. [PMID: 11865819 DOI: 10.1038/sj.bdj.4801314a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Dentists applying to a specialist training programme often receive conflicting advice over what to put in their curriculum vitae (CV). We conducted a survey of the Training Programme Directors of the dental specialties to determine what aspects of CV content and presentation styles are considered important. This has allowed us to construct guidelines for what to put in a CV. Recently, structured application forms have become increasingly popular and may be a more objective way to carry out the shortlisting process. The guidelines presented could also be used as a framework for medical personnel departments if structured application forms eventually replace the CV.
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Affiliation(s)
- P E Ellis
- Department of Orthodontics, Charles Clifford Dental Hospital, Sheffield.
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Abstract
The challenge of rehabilitating young, healthy transfemoral amputees may extend beyond the boundaries of teaching them to adapt to functional activities of daily living. The goal for several of these amputees is to participate and sometimes even compete in recreational activities, including running. These amputee runners require prosthetic adaptations as well as a comprehensive individualized training programme to ensure that their running is as safe and energy efficient as possible. To help amputees achieve this, clinicians must understand normal and prosthetic locomotion. This paper compares the biomechanical differences between walking and running in normal locomotion and analyses the running modes used by transfemoral amputees. The modified running mode achieved with the Terry Fox Running Prosthesis subjectively "looks" more energy efficient to the observer and "feels" more energy efficient to the user. These assumptions have yet to be confirmed or refuted by a rigorous scientific research study. An outline of the proposed physiotherapy protocol includes the familiarization, treatment, and training phases. Physiotherapists involved in amputation rehabilitation may not be commonly confronted with this level of patient expectation. It is their responsibility to give realistic guidance to these amputees so that they can safely and independently pursue their recreational running activities. This need can best be fulfilled by providing sound clinical advice which has been validated by research findings.
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Ellis PE, Novák VJ. Metamorphosis hormones and phase dimorphism in Schistocerca gregaria. I. Implantation of endocrine glands into hoppers reared in isolation; the effects on coloration. Endocrinol Exp 1971; 5:13-8. [PMID: 5317418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Abstract
Like other fatty oils from plants, olive and peanut oils, the most commonly used vehicles for the injection of juvenile hormone and its analogs, contain substances that show effects similar to those of this hormone. A dose of olive oil smaller than that used to dissolve a single injection of juvenile hormone will cause nuclear enlargement in the cells of the prothoracic gland of the desert locus and advance the succeeding molt.
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Osborne DJ, Carlisle DB, Ellis PE. Protein synthesis in the fat body of the female desert locust, Schistocerca gregaria Forsk., in relation to maturation. Gen Comp Endocrinol 1968; 11:347-54. [PMID: 5682909 DOI: 10.1016/0016-6480(68)90091-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Abstract
Bracken contains ecdysone derivatives that are active when injected into locusts. However, when fed to the desert locust as its sole or chief diet, it does not affect molting, growth, or development. There is evidence that, in locusts, the active ecdysones are dehydroxylated to (alpha)-ecdysone and passed out through the gut in the feces. There is no evidence for any uptake of ecdysones from the gut.
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Carlisle DB, Ellis PE, Brettschneiderová Z, Novák VJ. Growth disorders of the bug Pyrrhocoris apterus and the 'juvenile hormone' effect of certain papers. J Endocrinol 1966; 35:211-2. [PMID: 5914235 DOI: 10.1677/joe.0.0350211] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Abstract
A diet of senescent Brassica spp. delayed sexual maturation in the desert locust. The senescent leaves were shown to be short of gibberellins, and a dietary supplement of gibberellin A(3) (1 microgram per locust per day) restored the rate of maturation to that found in animals feeding on green leaves. An external application of eugenol had a similar effect. The sexual immaturity of desert locusts during the dry season may result from the senescent condition of their desert food plants.
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